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Photoluminescence and Structural Properties of CdSe Quantum Dot-Polymer Composite Films

Published online by Cambridge University Press:  19 November 2013

L. Borkovska ,
N. Korsunska ,
T. Stara ,
V. Bondarenko ,
O. Gudymenko ,
O. Stroyuk ,
O. Raevska  and
T. Kryshtab
L. Borkovska
Affiliation:
V. Lashkaryov Institute of Semiconductor Physics, NASU, pr. Nauky 41, 03028 Kyiv, Ukraine
N. Korsunska
Affiliation:
V. Lashkaryov Institute of Semiconductor Physics, NASU, pr. Nauky 41, 03028 Kyiv, Ukraine
T. Stara
Affiliation:
V. Lashkaryov Institute of Semiconductor Physics, NASU, pr. Nauky 41, 03028 Kyiv, Ukraine
V. Bondarenko
Affiliation:
V. Lashkaryov Institute of Semiconductor Physics, NASU, pr. Nauky 41, 03028 Kyiv, Ukraine
O. Gudymenko
Affiliation:
V. Lashkaryov Institute of Semiconductor Physics, NASU, pr. Nauky 41, 03028 Kyiv, Ukraine
O. Stroyuk
Affiliation:
L. Pysarzhevsky Institute of Physical Chemistry, NASU, pr. Nauky 31, 03028 Kyiv, Ukraine
O. Raevska
Affiliation:
L. Pysarzhevsky Institute of Physical Chemistry, NASU, pr. Nauky 31, 03028 Kyiv, Ukraine
T. Kryshtab
Affiliation:
ESFM - Instituto Politécnico Nacional, Av. IPN, Ed.9 U.P.A.L.M., 07738 Mexico D.F.Mexico
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Abstract

Thermal stability of the luminescent properties of CdSe and CdSe/ZnS quantum dots (QDs) in polymer films of gelatin and polyvinyl alcohol (PVA) is studied. Thermal annealing of the films at the air ambience at 100 °C is found to result in two effects in the photoluminescence (PL) spectra: (i) an enhancement of the PL intensity and (ii) a red spectral shift of the PL bands. The first effect is observed in both QDs-gelatin and QDs-PVA composites, while the second one - in the QDs-gelatin only. The passivation of CdSe QDs with ZnS shell reduces the effects. The enhancement of the PL intensity is supposed to be due to the decrease of nonradiative defect density. The red shift is explained by dissociation of coordination bonds between surface Cd atoms and amino-groups of gelatin. This dissociation decreases the PL intensity too. This effect competes with the effect of PL enhancement and is supposed to be responsible for non-monotonous dependence of the PL intensity versus annealing time in the QDs-gelatin composite.

Keywords

luminescencecompositesCdSe
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1617: Symposium 7E – Low-Dimensional Semiconductor Structures , 2013 , pp. 171 - 177
Copyright
Copyright © Materials Research Society 2013 

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